我已按照this link中所述的说明在树莓派上编译了PJSIP库。
当我运行以下命令apt-get install时：
sudo apt-get install automake autoconf libtool libsamplerate0-dev \
libspeexdsp-dev libspeex-dev libcelt-dev libzrtpcpp-dev \
libccrtp-dev libasound2-dev libdbus-c++-dev libgsm1-dev \
opus-tools libopus-dev libpcre3-dev libcommoncpp2-dev \
libdbus-1-dev libyaml-dev libv4l-dev libvo-amrwbenc-dev
我遇到以下错误：
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package libcelt-dev
E: Unable to locate package libzrtpcpp-dev
请，有人可以帮我吗？ 预先感谢。